10.8 Polarization of visible light Goal: Observe the eect of linear poiarizers. With the room lights onj locate the sample holder with white paper at the end of the optical bench. The paper acts as a convenient. low intensity, source of unpolarized visible light. Mount two of the rotatable polaroids on the optical bench and look through them at the paper. Rotate one of them and note how the transmitted intensity varies. Does rotation of one polaroid by 180 change anything? Explain what is happening. Which element(s) of your apparatus are analogous to the microwave transmitter? \"Thich element(s) are analogous to the microwave receiver? Rotate the rst polaroid until the light is extinguished. Now hold the third polaroid between these two crossed polaroids. Rotate the middle po laroid. How many maxima do you observe per 360 rotation? Remove the middle polaroid and hold the Ushaped acrylic piece in its place. Look through the crossed polarizers at the Ushaped end as you squeeze the opposite end of the acrylic. Note that, as you increase the stress: additional lines appear. Sketch the pattern in your lab book. noting the area 10.8 Polarization of visible light Room light on. Experimental setup. Photos taken by looking through the two polarizers and rotating the polarizer closest to the white paper by 0, 450, 90, 135, 180. O 0o 450 90 1350 180 Does rotation of one polarizer by 180 change anything? Explain what is happening. Which element(s) of your apparatus are analogous to the microwave transmitter? Which element(s) are analogous to the microwave receiver?Photo taKen by looking through the two polarizers with the polarizer closest to the v paper rotated to extinguish light. The two polarizers are said to be crossed. What is this minimum angie? A third polarizer is inserted between the two crossed polarizers. Rotate this polarize approximately 45 step for a total of 360\". Polarization axis of the third rectangular polarizer is along its long direction. How many maxima do you from the above photos as you rotate by 360\" the third polarizer? How many do you expect to observe per 360 rotation? Photo with the middle polarizer replaced with the U-shaped acrylic piece. Crossed polarizers Photos looking through the crossed polarizers for increasing stress applied to the U-shaped acrylic piece. No stress Medium stress Maximum stress Sketch the patterns that are seen as the plastic undergoes no stress to medium stress and to maximum stress. Do these patterns correspond to the areas of greatest stress